Portion of a display panel with a graphical user interface



FIG. 1 is a front view of a portion of a display panel with a graphical user interface showing a first image of a sequence of my new design; and,

FIG. 2 is a front view of a portion of a display panel with a graphical user interface showing a second image of a sequence of my new design.

The broken lines including the broken line showing of a portion of a display panel, text, zig-zags and other graphical user interface elements are included for the purpose of illustrating portions of the article and form no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-2. The process or period in which one image transitions to another image forms no part of the claimed design. 

CLAIM The ornamental design for a portion of a display panel with a graphical user interface, as shown and described. 